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« Descending through the clouds, trusting nothing but our instruments. Slowly decelerating, selecting flaps on schedule to create the perfect combination of drag and lift from the massive wings far behind my cockpit. Gear down: the enormous garage doors of the main landing gear open up, and I can...

28,519 просмотров • 8 месяцев назад •via X (Twitter)

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Why the 737 landing gear lever has an “OFF” position ✈️ It’s a question I get asked quite often and understandably so! “OFF” isn’t a logical position for the landing gear! The landing gear is retracted into the belly of the aircraft using hydraulic pressure. Once the gear is fully up, mechanical uplocks hold the gear safely in position. However, with the lever in the UP position, hydraulic pressure is still being applied to the system. This is unnecessary now that the gear is being held up with mechanical latches and places extra demand in the hydraulic pumps. So, once the gear has been retracted, the pilots will move the gear lever from UP to OFF as part of the after takeoff checklist. This simply removes hydraulic pressure from the retract lines. When the pilots configure the aircraft for landing, we move the landing gear lever from OFF to DOWN. This action releases the mechanical up locks and the gear is lowered using a combination of hydraulic pressure, gravity and air loads. Once the gear is fully down and locked, a green light - one for each set of wheels, will illuminate. Should the primary gear down sensors fail, we have a second set of green, gear down indicators on the overhead panel. As long as the gear is indicating down and locked on either the primary or standby indicator, the gear is down and locked and safe to land on 👍 In the very unlikely event that the gear won’t lower normally using the landing gear lever, we have a standby gear lowering system which allows the crew to manually release the gear uplocks and allow gravity to lower the gear - see my reel showing that system in operation . With airlinepilotperformance

aircraftmaintenancengineer

19,786 просмотров • 1 месяц назад

Remember the C-130 crash in Colombia a month ago and killed 24 and left 43 injured? News reports indicated the pilots were arrested after the preliminary report came out. Given the outcome, the preliminary report pointed to pilot actions, along with runway conditions and weather, underlining there were no mechanical issues with the aircraft. Key findings from the investigation include: No mechanical failures contributed to the accident. The aircraft departed Viru Viru bound for El Alto. Weather conditions at the destination deteriorated en route, with storms and hail reported, but the crew received no weather updates. On arrival at El Alto, the crew was cleared to land on runway 10. Due to convective activity on that runway, they opted to approach runway 28 instead. Runway 28 is located at 13,300 ft elevation, measures 4,000 m in length, and has a negative gradient of 1.55%. METAR data indicated winds between 050°/10 kt and 360°/08 kt. According to the Investigators, the approach was conducted above the glide slope and at excessive speed. The aircraft touched down on the nose gear only, approximately 1,200 m beyond the threshold. Without compression of the main landing gear struts, the brakes and thrust reversers remained unavailable. Once the main gear touched down, the aircraft entered a section of runway contaminated by hail and slush, resulting in hydroplaning in the final third of the runway, an overrun, and the accident. Info - Aviation today

Francisco Cunha

693,526 просмотров • 3 месяцев назад